Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Podcast

Does Rooftop Solar Actually Help the Climate?

Inside episode five of Shift Key.

Rooftop solar installation.
Heatmap Illustration/Getty Images

For a few weeks now, Heatmap’s staff writer, Emily Pontecorvo, has been trying to figure out if installing rooftop solar panels on your home actually reduces carbon pollution in a systematic way. In other words: If you own a home, and install solar panels on it, are you doing anything to change how much fossil fuel gets burned in your region or around the world? Or — somewhat counterintuitively — will your panels just increase the cost of electricity near you while shifting demand for those fossil fuels around?

On this week’s episode, we try to answer these questions in a satisfying way. Princeton Professor Jesse Jenkins and I welcome Emily to the podcast to discuss the messy truth of distributed solar power.

Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.

You can also add the show’s RSS feed to your podcast app to follow us directly.

Here is an excerpt from our conversation:

Emily Pontecorvo: My question is, if you're taking this solar-shaped hole out of electricity demand and that's displacing a cheaper utility-scale solar project, how do we go from that to you're not having an effect on emissions? Why is displacing that cheaper option than meaning that it's not as an effective climate action?

Jesse Jenkins: Well, because basically there's a certain amount of demand for solar-shaped production in the electricity system, right? And if you're reducing demand for electricity at exactly the time that a utility solar project would produce, then you're making the economics of building more solar incrementally worse as you add more distributed solar.

We still get basically the same amount of overall solar power in equilibrium. Like, you know, that's the amount that's profitable for people to invest in. It's just that you've shifted it from, again, cheaper projects at larger scale to more expensive projects at smaller scale, particularly in the U.S. We can come back to why the U.S. market is so, I think, broken and so much more expensive than it needs to be.

But particularly in the US, it is much more expensive, like three or four times more expensive, to build a megawatt worth of solar panels in 10 kilowatt increments at a bunch of different homes than it is to build one megawatt of solar on a big landfill or in a farm or on a big box store.

Pontecorvo
: So is the idea that, do you get less solar overall or is it?

Jenkins
: No, you basically get the same amount. You just get the same amount of solar and it's just more expensive.

Pontecorvo
: Why does it matter then? I mean, obviously it matters. It's a better outcome to have a cheaper clean electricity system. But ...

Jenkins: No, it's a great question.

So why does it matter? I mean, there's two questions.

You were asking before, like, does it amount to an effective climate action? Well, if it doesn't increase the overall supply of solar power in the regional grid, then no, it's not an effective climate action.

It might be fine for you to do it as a personal decision for other reasons like economics or feeling like you don't want to keep paying your utility because you don't like the utility and you want to generate your own power. Like there's lots of other reasons why you might do this. Or because you want to save land, right? We can talk about the sort of land-saving potential distributed generation, which I think is probably the best case for it.

But in terms of climate impact, it's null. If you're not increasing the supply of clean energy overall, you're just substituting one clean megawatt hour for another clean megawatt hour.

Why does it matter that we're making that megawatt hour more expensive? Well, at the end of the day, we have to keep our electricity supply affordable as we decarbonize. Both because it's important for equity reasons, because we don't want people who have a hard time paying their bills to have to pay a lot more. But from a climate perspective, because we have to radically expand the amount of electricity supply and decarbonize transportation and heating and industry and make hydrogen and do all these other things, that are going to require electricity to be relatively competitive against the fossil fuels that they're trying to displace in those sectors.

This episode of Shift Key is sponsored by…

KORE Power provides the commercial, industrial, and utility markets with functional solutions that advance the clean energy transition worldwide. KORE Power's technology and manufacturing capabilities provide direct access to next generation battery cells, energy storage systems that scale to grid+, EV power & infrastructure, and intuitive asset management to unlock energy strategies across a myriad of applications. Explore more at korepower.com.

Music for Shift Key is by Adam Kromelow.

Green

You’re out of free articles.

Subscribe today to experience Heatmap’s expert analysis 
of climate change, clean energy, and sustainability.
To continue reading
Create a free account or sign in to unlock more free articles.
or
Please enter an email address
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Climate

Wildfire Smoke Deaths Are Spiking as the Planet Warms

New research out today shows a 10-fold increase in smoke mortality related to climate change from the 1960s to the 2010.

A skull in fire.
Heatmap Illustration/Getty Images

If you are one of the more than 2 billion people on Earth who have inhaled wildfire smoke, then you know firsthand that it is nasty stuff. It makes your eyes sting and your throat sore and raw; breathe in smoke for long enough, and you might get a headache or start to wheeze. Maybe you’ll have an asthma attack and end up in the emergency room. Or maybe, in the days or weeks afterward, you’ll suffer from a stroke or heart attack that you wouldn’t have had otherwise.

Researchers are increasingly convinced that the tiny, inhalable particulate matter in wildfire smoke, known as PM2.5, contributes to thousands of excess deaths annually in the United States alone. But is it fair to link those deaths directly to climate change?

Keep reading...Show less
Climate

AM Briefing: Protecting Biodiversity

On the COP16 biodiversity summit, Big Oil’s big plan, and sea level rise

Can World Leaders Halt Biodiversity Loss?
Heatmap Illustration/Getty Images

Current conditions: Record rainfall triggered flooding in Roswell, New Mexico, that killed at least two people • Storm Ashley unleashed 80 mph winds across parts of the U.K. • A wildfire that broke out near Oakland, California, on Friday is now 85% contained.

THE TOP FIVE

1. Hurricane Oscar hits Cuba during blackout

Forecasters hadn’t expected Hurricane Oscar to develop into a hurricane at all, let alone in just 12 hours. But it did. The Category 1 storm made landfall in Cuba on Sunday, hours after passing over the Bahamas, bringing intense rain and strong winds. Up to a foot of rainfall was expected. Oscar struck while Cuba was struggling to recover from a large blackout that has left millions without power for four days. A second system, Tropical Storm Nadine, made landfall in Belize on Saturday with 60 mph winds and then quickly weakened. Both Oscar and Nadine developed in the Atlantic on the same day.

Keep reading...Show less
Yellow
Politics

America Is Becoming a Low-Trust Society

That means big, bad things for disaster relief — and for climate policy in general.

A helping hand.
Heatmap Illustration/Getty Images

When Hurricanes Helene and Milton swept through the Southeast, small-government conservatives demanded fast and effective government service, in the form of relief operations organized by the Federal Emergency Management Agency. Yet even as the agency was scrambling to meet the need, it found itself targeted by far-right militias, who prevented it from doing its job because they had been led by cynical politicians to believe it wasn't doing its job.

It’s almost a law of nature, or at least of politics, that when government does its job, few people notice — only when it screws up does everyone pay attention. While this is nothing new in itself, it has increasingly profound implications for the future of government-driven climate action. While that action comes in many forms and can be sold to the public in many ways, it depends on people having faith that when government steps in — whether to create new regulations, invest in new technologies, or provide benefits for climate-friendly choices — it knows what it’s doing and can accomplish its goals.

Keep reading...Show less
Blue